Question about 1995 Chevrolet C1500

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Brake Problems I have a 1995 Chevy C1500. I have recently replaced the master cylinder and the brake booster. I have also bled the brakes. I only have about 60% brakes and I have to pump them to get that. After being pumped several times the brake pedal sticks on the floor. Any ideas?

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  • 328 Answers

The only thing left unless you have a leak is the proportioning valve A soft pedal can also be caused by badly adjusted rear brakes but you shouldn't experience a pedal fade right to the floor with bad adjustment.

Posted on May 15, 2009

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Posted on Jan 02, 2017

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SOURCE: 89 c1500, full pedal on brakes until started then

adjust your rear shoes up so that the rear drums just turn, with them ajusted to a low setting the brake pedal will be low .
also when you start your engine it is noral for the pedal to drop because of the boster ! [ but not to the floor ]
Bruce Pike

Posted on Oct 10, 2009

  • 432 Answers

SOURCE: New master cylinder and booster. Brakes stop good

Well if you have bled it correctly starting at the farthest out(PS Side Rear) and working to the closest(DR Side Front) and you make sure to close the bleeder valve before letting up and repumping the peddel,then I would say that the seals in your new master cylinder may be bad.When you bled the second or third time if there was no air then I would say you have a bad master cylinder.If there was air then you have another problem.Well hope this helps and good luck.

Posted on Mar 14, 2010

SOURCE: Brake pedal goes nearly to

I would go with not bled correctly

The booster should hold up with a hard pedal until
you start the engine, then vacuum causes it to move
down when pressing on the brake

Posted on Sep 16, 2011

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maybe the vacuum booster behind the master cylinder. is the vacuum hose hooked up to it?? it could be leaking internally. you need a vacuum pump to test it though.

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Had the exact same issue with an 04 Cadillac srx. Replaced the booster twice...finally put my old "defective" master cylinder back on and brakes worked fine. Turned out the new master cylinder was bad...even though the symptoms point to the booster. Do check the vacuum hose going to the booster first though. Have seen those go bad and cause weird problems and it's the easiest thing to check first.

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Do you have to remove brake lines when you change the brake booster


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Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

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When truck is off,pedal is hard. after starting, pedal goes to floor. replaced master cylinder,bled brakes. changed front and rear pads.


I would inspect the brake booster for vacuum leak. When the booster is not working you get a hard pedal, yet when you start the vehicle the pedal will hit the floor because of the damaged diaphram inside the brake booster.

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I replaced disc brake pads, rear shoes. wheel cylinder,master cylinder, power brake booster all new. Question: My brake pedal is not solid,goes low to the floor almost. I have bled the master cylinder 1st,...


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Install new brake pads and rotors all 4 wheels. Replaced front 2 calipers. Bled brakes. New clean fluid coming out. pedal is still soft and goes to floor. 200 Seebring.


Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
Are you losing Brake Fluid and can't find a noticeable leak? Then there is a good posibility that the rear seal in the Master Cylinder is leaking and the Fluid is going into the Brake Booster - which is the large wheel shaped drum located on the fire wall. In this case both the Brake Booster and the Master Cylinder will have to be removed and replaced. The Booster contains seals that Brake Fluid is very caustic to and will ruin these seals- causing future failures.
If no Brake Fluid is lost, no leak found: Check the Brake Booster Vacuum Advance. This should be connected to the outside of the Booster, attached to a hose, with the hose going to the engine. Check to see if this is working properly. Replace if needed.

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89 c1500, full pedal on brakes until started then goes to floor. Bled system,replaced master cylinder and anti-lock system,now has better pedal but code 4 on brake lite that won't go out. Have replaced...


adjust your rear shoes up so that the rear drums just turn, with them ajusted to a low setting the brake pedal will be low .
also when you start your engine it is noral for the pedal to drop because of the boster ! [ but not to the floor ]
Bruce Pike

Oct 10, 2009 | 1989 Chevrolet C1500

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Replaced master cylinder bled as per specs but have dead pedal intermitantly. does this have to do with the abs system needing bled, if so how is that done.


Try changing the brake booster. The abs has nothin to do with the brake pedel. All the abs does is electronically adjust pressure applied to each wheel to keep the wheels from lockin up and sliding. You've either got a bad master cylinder or your brake booster is bad

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95 sub emerg/parking brake light will not turn off


Only two things should normally activate the light:

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I don't think you did any work to the Parking brake, but you should check it to be sure.

I believe that you would have double checked the fluid level, but please check it again.

Other things that could activate the light would be a worn or leaking master cylinder; improper brake fluid type; a damaged brake booster diphragm .

I have attached a link with excellent info on how a brake system works here.

Also, does the light always stay on, or only when you apply the brakes?

Brian

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